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I can see that this could be a huge problem.
A positive Rh factor can be either +/+ or +/- (positive/positive or positive/negative). Both will test positive.
However, when someone has O blood type, they are always O/O so they can only pass along the O blood group to their offspring. Therefore when both parents are O, offspring are 100% type O. The chances for Rh+ are 93.75% versus 6.25% Rh -.
A child who is AB negative cannot have even one parent who is O positive.
I would suggest that all three of you get blood typed again, since there has obviously been an error somewhere. Your primary provider can do this for you and your husband.
Here is a handy calculator used by all professionals for determining blood types:
Please let me know what additional questions and concerns you have about this.